Safely Deep-discharges NiCd battery - 04/29/99 EDN-Design ideas – NOTE: Scroll to find this circuit. Also available at - http://m.eet.com/media/1150682/25098-42999dI Nickel-cadmium (NIC d) batteries can possess an undesirable memory effect due to partial discharges. The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. Design by Jim Hagerman, Science & Technology International, Honolulu, HI
Safely swap SCSI disk drives - 09/30/99 EDN Design Ideas: When you insert an SCA2 (single-connector attach] drive into a live backplane, the power supply's bypass capacitors in the drive can draw huge transient. Design by Ajmal Godil, Linear Technology Corp, Milpitas, CA
Safety Device uses GMR sensor - 10-Jul-03 EDN Design Ideas: This design idea presents a differential safety device to prevent risks arising from current leakages in household applications. The proposed circuit uses a new method for differential current sensing (Figure 1). The method entails the use of Helmholtz coils and a magnetic sensor based on the GMR (giant-magnetoresistive] effect Design by J Pelegri-Sebastia and D Ramirez-Munoz, University of Valencia, Spain
Safety flasher warns of high voltage - 02/17/14 - EDN Design Ideas: A low power circuit warns the user that high voltage is present - Working on high voltage circuits can be dangerous. Capacitors can maintain high voltage in a system for a considerable time after power is removed Design by Clive Bolton
Save Property & Life with this - 05/13/10 EDN Design Ideas: The circuit in Figure 1 sounds an alarm whenever the perimeter- protection line—a thin copper wire of appropriate length—breaks. You can get the thin wire from a used relay coil. Place the wire around a tent, a camping area, or a Design by Vladimir Oleynik, Moscow, Russia
SCR Crowbar - The LTC1696 is a standalone power supply overvoltage monitor and protection device designed to protect a power supply load in the event of an overvoltage fault. it monitors two adjustable output voltages. if an overvoltage condition is detected, the output drives either an external SCR crowbar or turns off external back-to-back__ Linear Technology/Analog Devices App Note, Jul 8th 2011
SCR overvoltage crowbar - an over voltage crowbar protection circuit using a silicon controlled rectifier or SCR __ Designed by Ian Poole
Seatbelt reminder - No circuit description, schematic only__ CdS Electronic
Secure Bootstrap Operation under Light Load - 05/12/11 EDN Design Ideas: Additional circuit lets a capacitor charge, preventing voltage dips. A previous Design idea highlights a potential issue of a bootstrap IC under light-load or prechargedload operation (Reference 1). The circuit in Figure 1, with the additional circuit in the green box, fixes the problem of a voltage dip in the bus-voltage signal. The waveforms in Figure 2 demonstrate how this problem takes place in buck converter IC 1B when its output voltage, VBUS, dips below the regulation point at a fixed rate under no load. By inspecting the other traces in Figure 2, you can conclude that the dip of VBUS occurs Design by Chee H How, Kuala Lumpur, Malaysia
Series protection against power-line transients - 10/14/04 EDN Design Ideas: Voltage transients on low-voltage power lines can sometimes attain amplitudes many times the nominal voltage level. That behavior often calls for protection against the application of improper power levels. The usual way to protect Design by Alfredo Saab and Travis Eichhorn, Maxim Integrated Products, Sunnyvale, CA
Shock-Hazard Warning - Electrical leakage can cause lethal shocks. But such an unfortunate situation can be avoided with this shock-hazard warning system. it uses minimal number of components and does not need any separate...__ Electronics Projects for You
Short Protected Power Supply From PC 12V Supply - This circuit provides a short circuit protected power supply from PC 12V supply voltage. This is particularly handy when working with PC interfacing projects. __ Designed by M Asim Khan asimkhan @ sat.net.pk
Short-Circuit Beeper - Schematic Only__
Short-Circuit Protection for Boost Regulators - DN154 Design Notes__ Linear Technology/Analog Devices
Shunt regulator provides overvoltage protection - 01/15/98 EDN Design Ideas: The circuit in Figure 1 uses a typical technique for varying the output voltage of a power supply via a programmable control voltage. Although the topology and schematic details of the power supply are not critical, the protection technique is noveThis File contains several Design ideas, please scoll to this one[This design idea by ROBERT N BUONO, MAHWAH, NJ] Design by ROBERT N BUONO, MAHWAH, NJ
Simple Circuit Automatic-Shutoff Uses FeW Components - 07/23/12 EDN Design Ideas: This auto-shutoff circuit uses a bare minimum of components. You often need to include a timed automatic-turn-off circuit in battery-powered equipment to extend battery life. Previously published Design ideas for this function all involve many components (references 1 through 7). The circuit in Figure 1 is a simple automatic-shutoff add-on circuit featuring no quiescent current. Design by Benabadji Noureddine
Simple Circuit Blown-Fuse Indicator Sounds an Alarm - 10-Jul-08 EDN Design Ideas: A simple blown-fuse-indicator circuit sounds a buzzer and flashes an LED when a fuse blows Design by Vladimir Oleynik, Moscow, Russia
Simple Circuit Electronic Breaker - This circuit uses the on-resistance of the MOSFET as the current sensor. Reset it by removing the input power or the load. The circuit draws no current unless tripped. __ Designed by Andrew R. Morris
Simple Circuit for White LED Night Light - This simple circuit is designed to plug into a standard AC electrical outlet. it uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier circuit. . . Circuit by David Johnson P.E.-July, 2003
Simple Circuit Helps to Protect a Vehicle-Reverse Camera - 10/06/11 EDN Design Ideas: Add a delay to prevent short power pulses as you shift through reverse. Design by Aruna Rubasinghe
Simple Circuit Indicates Health of Lithium-Ion Batteries - 05/14/09 EDN Design Ideas: A simple inexpensive circuit quickly indicates a battery pack's health Design by Fritz Weld, Friedberg, Germany
Simple Circuit Night-Light Uses a Photoresistor to Detect Dusk - 12/15/11 - Design ideas - You can adjust this battery-powered circuit for different levels. Design by Chau Tran, Analog Devices, Malden, MA
Simple Circuit Prevents Processor Latch-up - 03/04/99 EDN Design Ideas: (contains several designs, scroll to find this one) The circuit in Figure 1 uses a Dallas Semiconductor DS1820 one-wire digital thermometer in a multipoint temperature-measurement system. The DS1820 sensor allows distributed temperature measurement and uses only one wire for both data communication and the power supply. You can easily connect the one-wire interface to a µC (in this example, a PIC 16C63). The application accommodates as many as 16 DS1820 sensors in a 100m-long network, dubbed MicroLAN by Dallas. Design by Michal Koby lecki and Wojda Wlodzimierz, MK Design, Warsaw, Poland
Simple Circuit Reverse-Polarity-Protection Has No Voltage Drop - 10/20/11 EDN Design Ideas: A relay does what semiconductors can’t do. Design by Aruna Rubasinghe
Simple Circuit Safely Deep-Discharges NiCd Battery - NIC d batteries possess an undesirable memory effect caused by partial discharges. The remedy is to do a complete discharge before charging again. Figure 1 shows a simple circuit which performs this feat. Although relatively straightforward in concept, the circuit has three redeeming features: 1) it is powered by the battery being discharged.2) After the battery is fully discharged current drain is only about 4 uA, usually well below the self-discharge of a battery alone.3) Near end-of-charge the LED flashes.9publised 04/29/99 EDN-Design idea) __ Designed by Jim Haggerman, Hagerman Technology LLC
Simple Circuit safely Deep-discharges NiCd battery - 04/29/99 EDN-Design ideas – NOTE: Scroll to find this circuit. Also available at - http://m.eet.com/media/1150682/25098-42999dI Nickel-cadmium (NIC d) batteries can possess an undesirable memory effect due to partial discharges. The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. Design by Jim Hagerman, Science & Technology International, Honolulu, HI
Single Transistor Provides Short-Circuit Protection - 16-Oct-03 EDN Design Ideas: in certain DC/DC-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provide as a direct path from the input to the short circuit through the inductor and the catch diode. Regardless of current-limit protection in the IC , when a short circuit exists in the load, extremely high cu Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA
Smart Battery Protector using a Shunt Regulator - The life expectancy of a battery dramatically reduces when it is discharged below the minimum recommended battery voltage. You must disconnect the load before discharging is complete. Otherwise, it can damage...__ Electronics Projects for You
Smart Emergency Light - Now you need not fear dark nights when power breaks down. Here’s a white LED-based emergency light that automatically turns on when mains power supply fails. The circuit consists of power supply, ...__ Electronics Projects for You
Smart switch cuts transformer turn-on current - 04/23/98 EDN Design Ideas: NOTE: File contains multiple circuits scroll to find this circuit. Transformer-core saturation can cause inexplicable fuse blowing, system crashes, or premature switch and relay failure. When a core saturates, it loses its inductive characteristics; primary winding Design by Robert Lindsey, Hansvedt EDM, Urbana, IL
SMF Battery Guard - The emergency light is an automatic system in which a rechargeable battery-operated light source turns on as soon as the mains power fails. When the mains supply resumes, the lamp turns...__ Electronics Projects for You
Smoke Extractor - Here is a low-cost circuit that automatically extracts solder fumes while you assemble a circuit, thereby saving you from inhaling the same. The solder paste gives off toxic fumes, which could...__ Electronics Projects for You
SMPS Spark Suppressor - This circuit protects the power plug of a switched-mode power supply (SMPS) against sparks that may damage its contact terminals. it normally happens when the device (laptop charger, mobile charger, etc)...__ Electronics Projects for You |